Sounds like a look-see move, then drop him to AAA in the spring or cut him outright.
Which is a poor team move, bring in a bunch of injured guys or guys who fell between the cracks, audition them, hope to get lucky, otherwise move on. Nail a few cheap players each year to fill out the roster.
TB personnel strategies with a rich team budget could be a killer, find bargains, develop players, but you can afford to lock down your best young players instead of trading them for pennies on the dollar before they hit FA.